Liquid fuel admission valve for internal combustion engines



April 14, 1936.-

L. COATALEN LIQUID FUEL ADMISSION VALVE FOR INTERNAL COMBUSTION ENGINESFiem Nov. 27, 1955 V/r/ WSSSQ nu IIIIIIIII Patented Apr'. 14, 1936UNITED STATES PATENT OFFICE LIQUID. FUEL ADMISSION vALvE Fon INTERNALconmUs'rIoN ENGmEs Louis Coatalen, Saint-Ouen, France spp'lieatianlNovmm21,1935, senat-No. sans: In Great Braam May 31, 1934 1 claiml (Cl.251-132) engines. The valve vcomprises a hollow stem 5 adapted tocontrol the admission aperture to the enginecylinder, both ends of thestem being exposed to fuel oil pressure. A

Difnculty is sometimes experienced through the leakage of fuel oil pastthe valve stem to the exterior of the guide piece through which the stemis inserted, and the'subsequent mixing of the fuel oill which hasescaped with the lubrieating oil supplied to the valve operatingmechanism. The object of the present invention is l5 to enable any fueloil which escapes past the valve stem to be collected without risk ofadmixture with other oil and to be returned to the fuel voil reservoiror other receptacle.

The invention consists in an improvement in 20 or modification of theliquid fuel admission valve claimed in the specification above referredto, comprising the combination with a hollow member carrying a guide forthe valve stem, of an oil chamber arranged at the upper end of the saidhollow member and adapted to enclose a part of the said guide and ofoperating mechanism for the valve stem, and an'oil discharge conduitleading from the chamber, the varrangement being such that the fuel voilwhich leaks past the valve stem can 'accumulate in the chamber. and theoil thus accumulated or some of it can escape from the chamber throughthe conduit. f

'I'.he accompanying drawing illustrates one manner of carrying theimprovement into effect.

Referring to the drawing, the valve guide a through which the valve stembis inserted is carried in a hollow cylindrical member c adapted to beattached to one end or the engine cylinder 4 (not shown). At its outerend this member c is extended to form a chamber. d which surrounds theguide a and also encloses a part of the'valve operating mechanism. Theouter v'end' -of the chamber may be fitted with a cover piece e.

accumulate inlthis chamber without risk of con-v y tamination bylubricating oil, and the oil thus accumulated or some of it can bereturned by a pipe ,f or other conduit to the fuel oil reservoir or f5fuel oil.which leaks past the valve stem can or the cover e, of thechamber d. One pair of ends of the rods are connected to the valve stemby an annular part h which embraces the part a and which supports a partp extending laterally from each side of the valve stem -through a trans-5 verse aperture s in the part a. By this arrangement of parts h, p, afulcrum-like connectionis provided between the valve stem'b and itsoperating part vh, so that the lifting of the valve in its guide iseffected without imposing any lat-1o eral pressure on the valve. Thevalve is moved on to its seating by a springq acting on another lannular member r which bears on the upper side of the projection p. Theother pair of ends of the rods extend beyond the upper end of the 1lichamber and are connected to actuating' rockers -or other operatingmeans situated adjacent to the outer endofthe valve guide oroil-chamber.: As in my previous invention, the fuel oil is conducted b'ya Apipe k to a chamberl in the outer end izoV of the valve guide, andfrom thence it flowsy down the hollow interior of the valve stem toanother chamber m at the end adjacent to the engine cylinder, the baseof this chamber being formed by the nozzlen which is controlled by thevalve. 26

Having thus described my invention what I claim as new and desire, tosecure by Letters 'Patent isz- In fuel admission valves for compressionignition engines, a hollow valve stem having one end 30 closed andanoutlet adjacent the closed end, said valve stem being disposed so thatboth ends are exposed to fuel oil pressure and being arranged to-controlthe admission apertureto the engine cylinder, a hollow member, a guidefor the valve 35 stem carried by said hollow member, an oil chamberarranged at `thevupper'end of'said hollow member and adapted to enclosea part of the said guide and a part of the operating mechanism for thevalve stem, and an oil discharge 40 conduit leading' from the chamber,said valve stem guide having a transverse aperture, an annular memberembracing the guide, a lateral projection on -the valve stem passingthrough an aperture in the guide, the under side of which 5 projectionis supported by the annular member,

means acting on said annular member for lifting the valve stem,A anotherannular member supported on the upper side of the said projection, and aspring acting on this latter annular member for moving the valve stemt'o the closed position, substantially as described..

LOUIS COATALEN.

